Brush-holder for dynamos.



H. STEINHART.

' BRUSH HOLDER FOB. DYNAMOS.

APPLICATION FILED we. 13, 1912.

1,073,643. Patented Sept. 23, 1913.

UNITED STATES PATENT OFFICE.

HERMANN STEINHART, 0F STUTTGART, GERMANY, ASSIGNOR TO THE FIRM OF ROBERT 30503,

BRUSH-HOLDER FOR DYNAMICS.

Specification of Letters Patent.

Patented Sept. 23, 1913.

To all whom it may concern:

Be it known that I, HERMANN Srnmrranr, a subject of the German Emperor, residing at Lerchenstrasse 74, Stuttgart, Germany,

the art to which it appertains to make and use the same.

' The present invention relates to a construction of brush holders for dynamics, and particularly to one well adapted for small machines such as ignition current generators for internal combustion engines, whereby the conductor to the generator may be conveniently and reliably connected electrically and mechanically to the collector brush.

In the accompanying drawings, Figure 1 represents a longitudinal section of the preferred form of my invention; Fig. 2 represents a view looking from the right of Fig. 1; and Fig. 3 represents a modified form of clamping means.

The member a, preferably of insulating material, has a longitudinal bore 9 passing through the member and screw-threaded near one or both ends, as at c, and a second bore h at an angle to the longitudinal bore and extending outwardly therefrom. This second bore is provided with a sleeve 7) of metal in which the spring-pressed collector brush 9' slides in order to maintain contact with a collector or commutator on the generator (not shown). The brush holder is fastened to the generator at the eye m.

The hollow cylinder d of metal is fitted securely in the longitudinal bore g so as to be in contact with the metal sleeve 7) and in electrical connection with the collector brush 7'. This cylinder has a special shaped interior, preferably a cylindrical central portion and flared ends. The hollow cylinder d may be securely fitted in the longitudinal bore in any suitable manner, but preferably in cases where the member a is of insulating material, by making the outer diameter of the sleeve (l slightly larger than the diameter of the bore 9, and then inserting the sleeve d into place before the member a is hardened by vulcanizing.

The clamping screw f preferably has a conical end is and an annular bearing Z at the base of the cone, so that when it is screwed into the longitudinal bore of the member 0., the uninsulated strands are forced apart from the center of the conductor e and are jammed fast against the flaring end of the cylinder d by the conical end of the screw, and also against the flat end of the cylinder (1 by the annular hearing Z. By this construction the conductor e may be inserted in either end of the longitudinal bore 9 while the screw 7 enters the other end thereof, preventing the conductor from being pulled out and also securely holding it in good electrical connection with the collector brush j.

In the modification shown in Fig. 3, the flat bearing at the base of the conical end 70, is omitted, the uninsulated end of the strands being held fast against the flaring part of the internal bore of the cylinder d without being forced' against the ends thereof.

Having thus described my invention, what I claim is:

1. In a brush holder and conductor clamp for dynamos, a member having a longitudinal bore passing therethrough and a second bore at an angle to the longitudinal bore, a metal sleeve mounted in said second bore to receive and make electrical connection with a collector brush. a hollow cylinder of metal mounted in the longitudinal bore and electrically connected with said sleeve, and means at one end of said sleeve for holding the uninsulated end of an electrical conduct-or, which enters the other end of the longitudinal bore, in contact with said cylinder to electrically connect the conductor with the collector brush.

2. In a brush holder and conductor clamp for dynamos. a member having a longitudinal bore passing therethrough, and a second bore at an angle to the longitudinal bore, a metal sleeve mounted in said second bore to receive and make electrical connection with a collector brush, a hollow cylinder of metal having a flaring terminal bore and mounted in the said longitudinal bore, and a screw at one end of the longitudinal 'bore having a tapered end adapted to enter the flaring bore of said cylinder to hold the uninsulated end of a stranded electrical conductor, which enters the other end of the longitudinal bore, in contact with said cylinder to electrically connect the conductor with the collector brush.

3. In a brush holder and conductor clamp for dynamos, a member having a longitudinal bore passing therethrough, and a second bore at an angle to the longitudinal bore, a metal sleeve mounted in said second bore to receive and make electrical connection with a collector brush, a hollow cylinder of metal having a flaring terminal bore and mounted in the longitudinal bore, and a screw atone end of the said longitudinal bore having a tapered end adapted to enter the fiarmg bore of said cylinder and also having a flat hearing at the base of the tapered end to hold the uninsulated end of a stranded conductor, which enters the other end of the longitudinal bore, in contact with said cylinder to electrically connect the conductor with the collector brush.

4. In a brush holder and conductor clamp for dynamos, a member having a longitudinal bore passing therethrough and screwthreaded nearboth ends, a hollow cylinder of metal mounted in the longitudinal bore, and a screw engaging the threads of the longitudinal bore at one end-or the other and adapted to hold the uninsulated end of an electric conductor, which enters the opposite end of the longitudinal bore, in contact With said cylinder.

5. In a 'brush holder and conductor clamp for dynamos, an insulator having a longitudinal bore passing therethrough and screw-threaded at both ends, a hollow cylinder of metal mounted in the longitudinal bore, and having flared openings at the ends, and a screw with a tapered end and an annular hearing at the base of the tapered end, 40 said screw engaging the screw-threads at one end or the other of the longitudinal bore and adapted to hold the uninsulated end ofi a stranded electric conductor which enters the opposite end of the longitudinal bore, 45 in contact with the flared interior and the end of said cylinder.

In testimony whereof I aflix my signature, in presence of two witnesses.

HERMANN STEINHART Witnesses REINHoLn ELWERT, PAUL WOLFART. 

